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.NET Forum / .NET Framework / New Users / August 2005Problem with currencymanager and TrueDBGrid
Hi, I have a problem with a currencymanager bind with a datatable which is the datasource of a Component One True DBGrid. An event update the datatable every 30 seconds and the problem occurs when we have one record and we pass to none, or we don't have any record and we add one record. When the datatable is modified by the events, all the procedures are done, but after, the application is frozen, but the code behind continue to run normally. The event still be raised every 30 seconds and behind all work fine, but the application is frozen, and I don't know why. I try to find where it can be frozen with breakpoints in my code, but the breakpoints are not reached. Is someone can help me? Regards Mathieu Lapointe If you're updating UI controls (directly or indirectly, e.g. via data source update) from another thread, your application will freeze from time to time. You have to use Control.Invoke to update your controls from another thread (e.g. System.Threading.Timer). This problem is well known to Compact Framework developers as CF application would freeze in ~99% of all cases. Desktop developers are mostly unaware they have to use Control.Invoke as it freezes in may be 1% of all cases. Even though it works most of the time, the problem remains and you have to do some extra work to ensure reliability of your application. Best regards, Ilya This posting is provided "AS IS" with no warranties, and confers no rights. *** Want to find answers instantly? Here's how... *** 1. Go to http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactfra mework?hl=en 2. Type your question in the text box near "Search this group" button. 3. Hit "Search this group" button. 4. Read answer(s). > Hi, > [quoted text clipped - 14 lines] > > Mathieu Lapointe Hi I update my datasource when I Receive a new Message through a MessageQueue on the ReceiveCompleted event of the MessageQueue. Cheers Mathieu Lapointe Yes, that's on a separate thread. Rule of thumb: assume events from all asynchronous methods (e.g. BeginReceive()) are on the separate thread. Please use Control.Invoke. In case you're not sure, there's Control.InvokeRequired to check if you have to use Control.Invoke. Best regards, Ilya This posting is provided "AS IS" with no warranties, and confers no rights. *** Want to find answers instantly? Here's how... *** 1. Go to http://groups-beta.google.com/group/microsoft.public.dotnet.framework.compactfra mework?hl=en 2. Type your question in the text box near "Search this group" button. 3. Hit "Search this group" button. 4. Read answer(s). > Hi > [quoted text clipped - 4 lines] > > Mathieu Lapointe Thank, It works and fix my problem Cheers Mathieu Lapointe Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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